January weather forecast
Portsmouth, Dominica

Weather in January

January, like December, in Portsmouth, Dominica, is another warm winter month, with an average temperature fluctuating between 28°C (82.4°F) and 21°C (69.8°F).

Temperature

With an average high-temperature of 28°C (82.4°F) and an average low-temperature of 21°C (69.8°F), January is the coldest month.

Rainfall

In Portsmouth, during January, the rain falls for 18 days and regularly aggregates up to 144mm (5.67") of precipitation. Throughout the year, in Portsmouth, there are 214 rainfall days, and 2252mm (88.66") of precipitation is accumulated.

Sea temperature

In Portsmouth, the average seawater temperature in January is 27.1°C (80.8°F).
Note: For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

Daylight

The average length of the day in January in Portsmouth is 11h and 20min.
On the first day of January, sunrise is at 06:32 and sunset at 17:46. On the last day of the month, sunrise is at 06:35 and sunset at 18:03 AST.

Sunshine

The average sunshine in January is 7h.

UV index

In January, the average daily maximum UV index is 9. A UV Index estimate of 8 to 10 represents a very high health hazard from exposure to the Sun's UV rays for the ordinary person.
Note: In January, the average maximum UV index of 9 translate into the following recommendations:
Take special precautions, as unprotected skin can be damaged and can burn quickly. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. A broad-spectrum sunscreen of SPF 30+ should be liberally applied and re-applied every two hours, and immediately after an outdoor workout or a swim. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.
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FAQ

What is the coldest month in Portsmouth?

January is the coldest month in Portsmouth, Dominica, with an average high-temperature of 28°C (82.4°F) and an average low-temperature of 21°C (69.8°F).

How much does it rain in Portsmouth in January?

In Portsmouth, in January, during 18 rainfall days, 144mm (5.67") of precipitation is typically accumulated.

What is the sea water temperature in January in Portsmouth?

In Portsmouth, Dominica, in January, the average water temperature is 27.1°C (80.8°F). For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

How many hours of daylight does Portsmouth have in January?

The average day length in January is 11h and 20min.

When is the sunrise / sunset in January in Portsmouth?

In January, on the first day of the month, sunrise is at 06:32 and sunset at 17:46. On the last day of the month, sunrise is at 06:35 and sunset at 18:03 AST.

How long on average sun shines in January in Portsmouth?

In Portsmouth, the average sunshine duration in January is 7h.

How high is the UV index in January in Portsmouth?

In Portsmouth, Dominica, the average daily maximum UV index in January is 9. A UV Index value of 8 to 10 symbolizes a very high health threat from unsafe exposure to Sun's UV rays.
Average rainfall days
Average sunshine
Average UV index

Average temperature in January
Portsmouth, Dominica

Average temperature in January - Portsmouth, Dominica
  • Average high temperature in January: 28°C

The warmest months (with the highest average high temperature) are June, July, August and September (31°C).
The month with the lowest average high temperature is January (28°C).

  • Average low temperature in January: 21°C

The months with the highest average low temperature are July, August and September (24°C).
The coldest months (with the lowest average low temperature) are January, February and March (21°C).

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Average rainfall in January
Portsmouth, Dominica

Average rainfall in January - Portsmouth, Dominica
  • Average rainfall in January: 144mm

The wettest month (with the highest rainfall) is November (300mm).
The driest month (with the least rainfall) is February (95mm).

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Average rainfall days in January
Portsmouth, Dominica

Average rainfall days in January - Portsmouth, Dominica
  • Average rainfall days in January: 18 days

The month with the highest number of rainy days is September (22 days).
The months with the least rainy days are February and April (14 days).

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Average sea temperature in January
Portsmouth, Dominica

Average sea temperature in January - Portsmouth, Dominica
  • Average sea temperature in January: 27.1°C

The best month for swimming (with the highest average sea temperature) is September (29.4°C).
The coldest month (with the lowest average sea temperature) is February (26.7°C).

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Average daylight in January /
Average sunshine in January
Portsmouth, Dominica

Average daylight in January / Average sunshine in January - Portsmouth, Dominica
  • Average daylight in January: 11h and 20min

The month with the longest days is June (Average daylight: 13h and 2min).
The month with the shortest days is December (Average daylight: 11h and 13min).

  • Average sunshine in January: 7h

The months with the most sunshine are March, April, May, June, July and August (Average sunshine: 8h).
The month with the least sunshine is December (Average sunshine: 6h).

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Average UV index in January
Portsmouth, Dominica

Average UV index in January - Portsmouth, Dominica
  • Average UV index in January: 9

The months with the highest UV index are March, April, May, June, July, August and September (UV index 12).
The month with the lowest UV index is December (UV index 8).

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